Robert I of Vexin was a nobleman in the 10th century, known for his role as the Count of Vexin, a region in northern France. He was a member of the Robertian dynasty, which played a significant part in the early history of the French monarchy. His lineage connected him to influential figures, including Hugh Capet, the first King of the Franks from the Capetian dynasty. Robert I was the son of Robert the Strong and the father of Hugh the Great. His family was instrumental in the establishment of the Capetian dynasty, which would dominate French royalty for centuries. Robert's legacy is tied to the political landscape of medieval France, where noble families often vied for power and influence.